Brush-holder and brush-holder support.



PATENTED JUNE 27, 1905.

L. A. TIRRILL.

BRUSH HOLDER AND BRUSH HOLDER SUPPORT.

APPLICATION FILED NOV. 28, 1904.

2 SHEETS-SHEET 1.

INVENTO'F'? l LeonardflTiPri-H,

PATENTED JUNE 27, 1905.

L. A-"TIRRILL. BRUSH HOLDER AND BRUSH HOLDER-SUPPORT.

APPLICATION FILED NOV. 28, 1904.

2 SHEETS-SHEET '2.

' INVENTOR LeorfiaPd'ffTirriH UNITED STATES latentecl June 27, 1905.

PATENT OFFICE.

LEONARD A. TIRRILL, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GEN- ERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

BRUSH-HOLDER AND BRUSH-HOLDER SUPPORT.

SPECIFICATION forming part of Letters Patent No. 793,474, dated June 27, 1905.

Application filed November 28,1904. Serial No. 284,452.

To all whom, it 1naty'c0ncern:

Be it known that I, LEONARD A. TIRRILL, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Brush-Holders and Brush-Holder Supports, of which the following is a specification.

My present invention has for one of its objects the production of a simple and eflicient brush-holder.

Another object of my present invention is the provision of a brush-holder yoke or support which may be readily adjusted with reference to the part of the dynamo-electric machine upon which it is mounted in order to properly position the brush-holders, but which can be readily removed from the dynamoelectric machine and returned again without affecting the adjustment.

The Various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification.

For a better understanding of my inven-" tion, however, reference may be had to the accompanying drawings and description, in which I have illustrated and described one of the forms in which my invention may be embodied.

Of the drawings, Figure 1 is an elevation with parts broken away and in section, showing an electric motor equipped with my invention. Fig. 2 is an end elevation of the motor shown in Fig. 1, with parts broken away and in section. Fig. 3 is an elevation with parts broken away and in section, showing a portion of the brush-holder yoke and one brush-holder. Fig. i is a section of the brush-holder on the line 44 of Fig. 3. Fig. 5

is a plan view showing a portion of the brushholder yoke and guide-plate in operative position with the supporting-lugs in section. and Fig. 6 is an elevation of the guide-plate.

In the drawings, 1 represents the field-ring ofan electric motor, such as is used for driving automobiles andfor other purposes. The armature-shaft 2 of this motor is journ aled in suitable boxes 3, carried by end members 4:,

secured to the field-ring 1 by bolts 5. The armature-shaft 2 supports the armature 6 and the commutator 7 in the usual manner.

In the construction shown the field-ring 1 is provided with a pair of lugs 8, in which bolts 9, extending parallel to the armature-shaft, are tapped. The brush holder yoke 10 is formed with elongated slots 11, through which the bolts 9 pass. A pair of small bolts l2 are tapped into a portion of the brush holder yoke between the slots 11. A guide plate or member 13 is formed with openings 14 at its ,end just large enough to receive the bolts 9.

Curved openings 15 are formed in the guideplate 13 between the openings 14. The openings 15 are shaped so that when the yoke 10 and plateil3 are both mounted on the bolts 9 the walls of the slot 15 will not interfere with the movement of the yoke 10 with respect to the bolts 9. The bolts 12 form a means by which the guide-plate 13 and yoke 10 may be rigidly clamped together. Similarly the bolts 9 form a means for rigidly clamping the yoke 10 and guide-plate 13 against the lugs 8.

, The brush-holder yoke 10 is formed with downwardly-projecting arms 20, which support at their ends studs or pins 21, upon which the brush-holders 22 of the machine are mounted. In the particular construction shown a pair of brush-holders 22 are mounted on each stud 21. Each brush-holder 22 comprises a member 23, which maybe adjustably secured in any desired position on the stud 21 by a clamping-bolt 24. A projection 25 from the member 23 has pivoted to it the brush-carrying member 26 of the brush-holder. The free end of the inember 26 has clamped to it a brush 27, which may be formed of carbon in the usual manner. The member 26, which may be formed of cast metal, comprises two parallel side portions 28, which are separated by a distance equal to or greater than the width of the member 23, a portion of which is included between the side portions. upper edges of the member 28 are connected by an integral web portion.

On the upper side of the member 26 proper is located a tubular extension 30. The upper end of the brush-tension spring 31 extends from the member 23.

into the tubular extension 30. The lower end of the spring 31 is secured to an extension 32 The upper end of the spring 31, which in the construction shown is helical, is secured to a nut 33, which it surrounds. A bolt 34, having a knurled head 35, passes through an opening formed for the purpose in the upper end of the extension and is threaded into the nut 33. A projection 36 from the nut 33, extending into a channel formed for the purpose in the wall of the extension 30, serves to prevent angular movement of the nut relative to the extension 30.

By loosening the bolts 9 and 12 the brushholder yoke 10 may be adjusted to obtain any desired angular adjustment of the brushes 27 relative to the commutator 7. After the desired adjustment is obtained further angular movement of the brush relative to the commutator is prevented by clamping the guideplate 13 between the yoke 10 and the bolts 12. After the yoke 10 and guide-plate 13 are clamped together the brush-holder yoke, after being removed from the bolts 9 to allow the removal of the armature from its normal position within the field-ring or for other pun poses, may be readily returned to the proper position.

The brush-holder construction shown is simple, reliable, and of excellent mechanical construction. The tension of the spring 31 may be readily adjusted by rotating the bolt 3 1. It will be observed that with the construction shown the helical spring extends in a direction substantially parallel to that of the line of movement of the brush and is entirely surrounded and protected by the other parts of the ln'ush-holder and that this result is obtained without destroying the general compactness of the brush-holder. The extreme tip of the projection 32 is adapted to engage a shoulder 37 to prevent member 26 from engaging the commutator when the brush 27 is unduly shortened.

WVhile the construction hereinbe'fore described and illustrated is the best form of my invention now known to me, it will be readily understood by all those skilled in the art that the'construction shown is only one of the forms in which my invention may be embodied, and I do not intend the claims herein made to be limited to the construction shown more than is made necessary by the state of the art.

WVhat 1 claim as new, and desire to secure by Letters Patent of the United States, is

1. In combination, a brush-holder yoke or supporting member, a support therefor to which it is adjustably and movably secured, a member adapted to be secured to said support in one relation only, and means for securing said member and said brush-holder yoke in fixed relation to each other.

2. In combination, asupport provided with projections, a brush-holder yoke formed with apertures through which said projections extend, said apertures being shaped to allow relative movement between the projections and the yoke, a guide-plate formed with openings exactly fitted to receive said projections, and means for rigidly securing said yoke and said guide-plate together.

3. A brush-holder yoke formed with elongated slots, a support therefor formed with stud bolts or pins passing through said slots, a guide-plate exactly fitted to receive said stud bolts or pins, and means for clamping said guide-plate and brush-holder yoke together.

at. A brush-holder comprising a stationary member, a movable brush-carrying member pivoted thereto, said movable member being formed with a chambered extension, and a helical tension-spring, one end of which extends into said chambered extension and is adjustably secured to said movable member and the other end of which is secured to said stationary member.

5. In combination, a support provided with pins or projections, a brush holder yoke formed with slots through which said pins pass and being adjustable with reference to said pins by reason of the elongation of said slots, a guide-plate formed with openings litted to and through which said pins pass, and means for detachably securing said yoke and said guide-plate together.

6. In combination, a support provided with pins or projections, a brush holder yoke formed with slots through which said pins pass and being adjustable with reference to said pins by reason of the elongation of said slots, a guide-plate formed with openings fitted to and through which said pins pass, and means for securing said yoke and said guideplate together.

7. A brush-holder comprising a stationary member, a movable member pivoted thereto, a brush carried thereby, a chambered extension formed on said movable member, and a helical spring connecting the stationary and movable members of the brush-holder extend ing substantially parallel to the line of movement of the brush with one end passing into said chambered extension.

In witness whereof I have hereunto set my hand this 25th day of November, 1904.

LEONARD A. TIRRILL.

Witnesses:

JOHN A. MoMANUs, Jr., DUGALI) MeK. LiIeKILLoP. 

